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Spindle motor having a low overall height

a spindle motor and overall height technology, which is applied in the direction of sliding contact bearings, instruments, record information storage, etc., can solve the problems of not being able to achieve the required holding power between the components, and the capillary sealing gap needs sufficient space, so as to reduce not impair the stability of the bearing and the function. , to achieve the effect of reducing the overall height of the spindle motor

Active Publication Date: 2014-02-20
MINEBEAMITSUMI INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention aims to reduce the overall height of a spindle motor without compromising bearing stability and functionality. This is achieved by improving the alignment of the stopper part with the shaft and introducing a labyrinth seal to prevent excessive evaporation of bearing fluid. The design also eliminates the need for an interference fit between the shaft and the stationary bearing part, thereby facilitating precise machining of the bearing surfaces.

Problems solved by technology

On the one hand, the radial bearing span should be reduced as little as possible to prevent any deterioration in stability and bearing stiffness, and on the other hand the clamping system for the shaft in the bearing part or respectively the overall height of the stopper part should not be made too small, otherwise it will no longer be possible to attain the required holding power between the components.
Moreover, the capillary sealing gap needs sufficient space to ensure an adequate sealing effect even under the impact of shock.

Method used

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  • Spindle motor having a low overall height
  • Spindle motor having a low overall height
  • Spindle motor having a low overall height

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Embodiment Construction

[0029]FIGS. 1 to 3 show three slightly different embodiments of a spindle motor according to the invention having a low overall height and a fluid dynamic bearing system. This kind of spindle motor can be used for driving the storage disks of a hard disk drive.

[0030]The spindle motors according to FIGS. 1 to 3 are largely identical in their basic construction and mainly differ in their overall height and the design of the sealing gaps. FIG. 1 shows a spindle motor having an overall height of approximately 7 mm, whereas FIGS. 2 and 3 show a spindle motor having an overall height of approximately 5 mm.

[0031]The basic construction of the spindle motor according to the invention is described on the basis of FIG. 1. The spindle motor comprises a baseplate 10 that has a substantially central cylindrical opening in which a stationary bearing part 16 is accommodated. The stationary bearing part 16 is approximately U-shaped in cross-section and has a central opening. The stationary bearing p...

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Abstract

The invention relates to a spindle motor that comprises a stationary motor component having a shaft and an annular stopper part disposed at a free end of the shaft as well as a rotatable motor component that is rotatably supported by means of a fluid dynamic bearing system with respect to the stationary motor component. The rotatable motor component is driven by an electromagnetic drive system. A housing cover covers the spindle motor. The invention is characterized in that the shaft has a step on which a stopper part rests, the end face of the stopper part projecting axially beyond the end face of the shaft, and the housing cover resting only on the end face of the stopper part but not on the end face of the shaft.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a spindle motor having a low overall height, particularly a spindle motor having a fluid dynamic bearing system as can be used to drive a hard disk drive (HDD).PRIOR ART [0002]Spindle motors, as used to drive the latest hard disk drives acting as electronic storage media, are miniature motors that are rotatably supported by means of a fluid dynamic bearing system.[0003]This kind of spindle motor comprises a stationary motor component as well as a rotatable motor component that is rotatably supported about a rotational axis with respect to the stationary motor component by means of the fluid dynamic bearing system. The rotatable motor component is driven in rotation in a well-known manner by an electromagnetic drive system, consisting of a stator having coil windings as well as a permanent magnetic rotor. This kind of spindle motor is generally mounted on a baseplate that simultaneously acts as a lower housing component which ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K5/167
CPCH02K5/1677H02K5/1675G11B19/2009F16C17/107F16C2370/12
Inventor FUSS, THOMAS
Owner MINEBEAMITSUMI INC
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